Driving mechanism



- Dec. 17, 1935. R. K. LEE

DRIVING MECHANISM Filed July 27, 1933 A TORNEY or no vibration during operation from a driving STATES the present invention; o g

P18. 2 is an enlarged section on line 2 -2 of .1; and i Patented Dee; 17 1935 PATENT: oFFi-cs DRIVING MECHANISM 7 Roger K. Highland Park, Mich, assignor to g Chrysler Corporation, Detroit, Mich, a corpo- V ration or Delaware Application July 21, 1933, Serial No. 682,361

This invention relates todrive connections and more especiallyto internal and extern types of friction drive connections.

Some of the objects of this invention are: to provide improved means for transmitting power from a drivingtoa driven element; to provide a simple and efilcient driveconnection which is quiet in operation; to provide a drive connection comprising a small number of simply and economically constructed-parts; to'provide a drive connection having easily replaceable parts; to

provide a drive-connection which transmits little to a driven element and vice verse; to provide a driving connection which is easily assembled and practically self adjusting during operation;

a to provide a drive connection including a resil-j ient member. and one drive element whichjaffords contact over a considerable'area with the other-drive element; to provide a rigid backing member for such resilient element to insure proper positioning of the same; and to provide means for detachably mounting the resilient t member in concentric relation on one of the ,drive' elements.-

Other objects and advantages will become apparent from the following description and appended claimsr f v For the purpose of illustrating the genus of the invention; a typical concrete embodiment is. shown in the accompanying drawing, in which:

Fig. 1 is a side elevation :with parts brokenaway and in section-of drivinga'nrl driven units according fto connected 1 by a drive mechanism Fig. 3 is a section one still more enlarged scale, taken on the line H of Fig. 2..

'Reierringtothe drawing, ll and I2 1 driving and driven units s cured to a suitabe base I. by means of bolts 13. The shafts l4 and ll of these units are arranged in substantially parallel but eccentrlc relation andxpreferably one or both of the units is secured to the base in so that the unit or units may he movedlaterally to adjust the distance between the-axes of the shafts.

The driving connection between the shafts l4 and ll constitutes the subject-matter of this invention, and it is to be-understood that either ofthe units II or l2 may be the driving or driven unit. The driving connection comprises a hub l6 secured to theshaft |7in axially ad-u justed position by means of a set screw'll'and' vided by the flanges 3| and 22 and the screws 33.

- 30m (or. 14-266) a flat portion s formed on the see us. By virtue of this'construction the hub l6 may be adjusted axially of the shaft it toward or away from "the unit ii. A drum 20 is secured to the huh I 6 by means of screws 2| projecting through flanges 22 formed on the hub l6. The-drum 20 is provided with a laterally directed flange 23 in which is formed a radially inwardly directed and inwardly diverging groove 24 arranged concentric with respect to the axisof'the shaft l5.

A hub member 26 is non-rotatably hired to the shaft ll of the unit II by means of aset screw 21 cooperable with'a flat portion-28 formed on the shaft. The flat portion 28 is extended along the shaftltso that the hub 26 may be-i5 adjusted axially along the shaft 14 toward or away from the unit l2. The hub portion 26 is provided with an integral annular enlarged por tion 30 having a flanged portion 3| directed out-,

iwardly 'and then inwardly at an angle with respect to a line extended radially outwardly from the axis of shaft l4 and through the center of the flange portion 30. A similarly formed flange portion 32 is detachably secured to the opposite portion of. the flange portion by means of 2 screws '33 so that the flange portions 3| and 32 .p 'form .a radiallyoutwardly converging groove "portion 35. The groove portion 36 is adapted to receive a resilient element36 in the form of a rubber annulus or inverted V belt; The re- 30 f fsilient 'annular member 36 has outwardly cone verging walls 31 complementary to the walls of the groove 24 of druin 20. A- rigid backing member lli'may be embedded :in the annulus 36 audit in itself in the form of I by the flanges n and s2 and the screws as and the shafts or is or both are adjusted sothat I the annulus a has its outer periphery in the groove 24 of the drum 20. Thedistance betweenthe axes r thlshafts and Isis adiusted so that the outer periphery f the am nulus 36 will have the desired frictional engagement with the walls of the groove 24, and so that power may be transmitted from the unit II to the unit I! or vice versa. The shafts l4 and I! may be adjusted so that the annulus 36 exerts the desired pressure against the groove portion 24 displacing the material of the annulus 36 so that contact between the annulus and the groove 24 extends over a considerable area, which area is greater by virtue of the internal external disposition of the annulus and drum than would bethe case of external peripheral contact between both of these elements. The resilient annulus 36 affords a silent drive between the driving and driven units and ,minimizes the transmission of vibration from one unit to the other. Due to the resiliency of the annulus I close adjustment of the distance between the axes of the shafts I4 and i5 is not required.

'In case of wear of the annulus 38 it may be replaced by an annulus including an embedded backing ring .ll as a unit by removing the screws and the flange "and then clamping a new annulus and backing member between the flanges ll and 32 by means of the screws 33. Washers It may be positioned between the flange portions SI- and 32 so that the rubber annulus is not tightly clamped between the flange portions but free to be shifted to eccentric positions with respect to the axis of the shaft ll. with the annulus l8 loosely mounted between the flange portions II and 32 and'the annulus engaged with the walls of the groove N, there .will

be a slight clearance between the walls 31 of the annulus and the flange portions 3| and 32 adjacent the engaged portion of the drum III, as indicated at 3!. The diametrically opposite .por-- tion of the annulus It is, however, wedged between the diametrically opposite portions of the flange portions of. the clamping flanges. The backing ring 40 embedded in the annulus 36 not only maintains the shape of the annulus but prevents the lateral walls of the annulus from being materially compressed or buckled inwardly so that frictional engagement is maintained over -a considerable area of the clamping flanges and the rubber annulus. with this construction,end

play of either or both shafts I4 and It will not cause excessive cutting or wear of the annulus 86 since the clearance 39 can be made greater than the end play occurring in thedriving and driven shafts. During operation-of the device including the washers a, the'annulus as rotates about an axis eccentric with respect to the shaft 'cludes the backing ring wardly directed'and inwardly diverging annular ll and disposed between the axes of the shafts H and IS, the annulus contacting the groove 24 but not the adjacent portions of the clamping flanges 3i and 32. The diametrically opposite portion of the annulus, however, is wedged be- 5 tween the clamping-flanges insuring the drive between the clamping flanges and the annulus without excessive creeping of the latter.

Since many changes could be made in the above construction, and many apparently widely diflerent embodiments of' this invention could be made without departing from the scope there-- of, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrated and 15 not in a limiting sense.

v I claim: 1. In an internal-external drive connection, driving and driven members including anannulus of substantially V-shaped section and of 20 resilient material, a rigid backing ring, secured to said annulus at one periphery thereof, clamption of said annulus and forcing the diametrically opposite portion oi! the annulus into frictional engagement with said clamping means.

2. In an internal-external drive connection in- 30 eluding driving andv driven members, an outwardly coverging rubber annulus, a rigid backing ring embedded in the inner periphery of said annulus, converging annular clamping flanges secured to one of said members for loosely re- 'ceiving the portion' of said annulus which inerebetween and an ingrooved portion adapted "to engage a portion of the-outer periphery of said annulus and force a 40 diametrically opposite portion of the annulus into frictional engagement with said clamping flanges.

3. A driving connection including driving and driven members, a resilient annulus 's'hiftably mountedon one of said members and normally held in non-concentric relationship with respect thereto, said annulus having a portion thereof in frictional engagement with the other member and adapted to be forced into'frictional driving engagement with said first named member-over a portion thereof substantially diametrically opposite to the frictionally engaged portion of said other member.

; 4 ROGER K. LEE. 5 

